So, what causes lower quality?
rob wrote:
Joerg Schilling wrote:
Can I copy an audio - cd in dao-mode on-the fly with cdrecord like
cdrdao d=
oes=20
Cdrecord does not support this by intention because this would
usually lower quality.
What causes lower quality in this situation? Is it copying in DAO
mode, or on-the-fly?
I don't know how DAO mode would lower quality. It reads all of the
audio data on the disk, then writes it to another disk with the same
track layout. (I know there's a little more going on than that...)
cdrdao supports paranoia. I expect data read from a CD with paranoia
to be exactly what's on the CD, except when the CD is very badly
damaged, in which case the application reports the bad data section.
Except in the "very badly damaged case", because the written audio
data is exactly the same as on the source CD, I can't see how DAO can
cause lower quality.
on-the-fly mode is described by the man page for cdrdao as "Perform CD
copy on the fly without creating an image file." I can't imagine how
that would cause lower quality.
I do see cdrdao being beneficial if you want to keep the original CD's
track pre-gap lengths and/or hidden tracks. The man page even has
examples for creating your own CDs with non-standard track pre-gaps
that have lengths other than 2 seconds and contain nonzero audio data.
I did some quick Google searches for cdda2wav and "hidden track". I
didn't see anything there or in the man page for extracting hidden
tracks, but I also have not tried to do it. According to the man page
for cdrecord, changing the pre-gap length is only usable on TEAC
drives. Is there an easy way to copy a whole disk and preserve the
hidden tracks and pre-gap time with cdrecord and cdda2wav (or another
extraction program)?
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